[SR-Users] Call to MS Teams

Володимир Іванець volodyaivanets at gmail.com
Fri Oct 15 15:37:50 CEST 2021


I figured it out. I messed up the R-URL. Following requests to MS Teams had
to have R-URI from the last response's Contact header value while being
sent to the same destination as the original INVITE.


Regards, Volodymyr Ivanets

чт, 14 жовт. 2021 о 18:04 Володимир Іванець <volodyaivanets at gmail.com> пише:

> Hello all!
> I'm trying to make a call from the system with Kamailio to a MS Teams. I
> can answer in the Teams client, system will receive response 200 OK and
> audio streams will be started.
> The problem I have is that after a short period of time Teams sends BYE
> with the reason "An acknowledgement was not received for the call
> acceptance in the allotted time". If I try to hangup from the system side,
> Teams will receive BYE and respond with "481 Call Leg/Transaction Does Not
> Exist" - "Call leg unavailable".
> It looks like Teams can not match and accept ACK request to finish
> establishing the call and the following requests have the same problem.
> I was wondering if someone had this problem before or can share a SIP
> packet capture (of course with hidden addresses and domain names) of a
> correctly established and completed call to Teams?
> Thanks a lot!
> Regards, Volodymyr Ivanets
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